GROWTH HORMONE RESPONSES TO CONTINUOUS AND INTERMITTENT EXERCISE IN FEMALES UNDER ORAL CONTRACEPTIVE THERAPY
- Authors
- Corporate Authors
- Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
- Abstract
- In this study wer investigated the effect of oral contraceptive (OC) use (OCU) and non-use (OCNU) on growth hormone (GH) responses to exercise in the same females (n = 7, age 22-31 years) during the normal course of OC therapy. Continuous (60% maximum oxygen consumption, VO2max for 20 min) and intermittent exercise (>80% VO2max) protocols of equal total duration, and similar external work were performed during phases of OCNU (days 3-5 of the menstrual cycle) and OCU (days 7-11). Levels of GH, lactate, 17 beta-estradiol, and progresterone were measured. Lactate responses were significantly greater (P < 0.05) during intermittent than continuous exercise, with no effect of OC use. However, significantly greater GH responses were found during the OCU phase than the OCNU phase in both the continuous (+94%) and intermittent (+250%) exercise protocols. Estradiol and progresterone levels increased significantly during exercise in all four conditions. We suggest that the increased GH responses observed during the OCU-phase were potentiated by the elevated levels levels of total estrogens (endogenous 17 beta-estradiol and exogenous ethinyl estradiol). TRUNCATED
- Report Number
- DCIEM-98-P-53 — Reprint
- Date of publication
- 01 May 1998
- Number of Pages
- 8
- Reprinted from
- Eur J Appl Physiol, vol 79, 1998, p 24-29
- DSTKIM No
- 99-00209
- CANDIS No
- 510029
- Format(s):
- Hardcopy;Document Image stored on Optical Disk
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